An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
The tallest mountain in Australia is Mt Kosciuszko, at 2228m (some sources say 2229m), or 7310 feet. It is situated in the Australian Alps, in southern New South Wales. Whilst Australia's highest mainland mountain is Kosciuszko, Mawson Peak on the Australian external territory of Heard Island is higher, at 2745 m.